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More than the color of the kayak, I would like to know the visibility of the water at the surface in each instance. If it is generally less than say 15' (at the speeds they are probably traveling) then you might infer that the sharks are attacking a silhouette more than anything else. That could also cloud the data if the sharks can't tell until last second that a Hobie has fins. However, if the sharks are seen before the attack or the water is generally very clear, then all bets are off on that.
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